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The JavaScript Pocket Guide: Arrays

May 5, 2010

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Arrays and loops have endless uses in JavaScript programming. Lenny Burdette tells you all about arrays.

This chapter is from the book 

JavaScript Pocket Guide, The

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Arrays are a great tool for organizing and manipulating a lot of data. JavaScript arrays can store any of the JavaScript data types in any order. If you store your data in arrays, operating on it is simply a matter of looping over each value. It's a simple operation, but you'll find that arrays and loops have endless uses in JavaScript programming.

Creating Arrays

The best way to create a new array is with the array literal syntax ([]), but the array constructor function is available too. If you pass a single number value to the constructor function, you get an array filled with that many undefined values.

var myArray = [];
var myFilledArray = new Array(4);
myFilledArray;
[undefined, undefined, undefined, undefined]

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